httpclient post请求代码

以下是使用 Apache HttpClient 发送 POST 请求的 Java 代码示例：

import org.apache.http.HttpEntity;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

import java.io.IOException;

public class HttpClientPOST {

    public static void main(String[] args) throws IOException {

        String url = "https://example.com/api/v1/users";
        String requestBody = "{\"name\":\"John Doe\",\"email\":\"johndoe@example.com\"}";

        HttpClient httpClient = HttpClientBuilder.create().build();

        HttpPost httpPost = new HttpPost(url);

        // 将请求体设置为 StringEntity
        StringEntity stringEntity = new StringEntity(requestBody);
        httpPost.setEntity(stringEntity);

        // 执行 POST 请求
        HttpEntity responseEntity = httpClient.execute(httpPost).getEntity();

        // 读取响应体
        String response = EntityUtils.toString(responseEntity);
        System.out.println(response);
    }
}

在上述示例中，我们使用 `HttpClientBuilder` 类创建了一个 `HttpClient` 实例，并使用 `HttpPost` 类创建了一个 POST 请求对象。然后，将请求体设置为 `StringEntity`，并将其传递给 POST 请求对象。最后，使用 `HttpClient` 实例执行 POST 请求，并读取响应体。